//
//  IPTool.m
//  AppShellTool
//
//  Created by IOS01 on 2022/12/6.
//

#import "IPTool.h"
#import <ifaddrs.h>
#import <arpa/inet.h>
#include <netdb.h>
#include <net/if.h>
#import <dlfcn.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#import <SystemConfiguration/CaptiveNetwork.h>

@implementation IPTool

+ (nullable NSString*)getCurrentLocalIP

{

    NSString *address = nil;

    struct ifaddrs *interfaces = NULL;

    struct ifaddrs *temp_addr = NULL;

    int success = 0;

    // retrieve the current interfaces - returns 0 on success

    success = getifaddrs(&interfaces);

    if (success == 0) {

        // Loop through linked list of interfaces

        temp_addr = interfaces;

        while(temp_addr != NULL) {

            if(temp_addr->ifa_addr->sa_family == AF_INET) {

                // Check if interface is en0 which is the wifi connection on the iPhone

                if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {

                    // Get NSString from C String

                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];

                }

            }

            temp_addr = temp_addr->ifa_next;

        }

    }

    // Free memory

    freeifaddrs(interfaces);

    return address;

}

@end
